Pre-distortion techniques and bandwidth efficient modulation for military satellite communications

Balasubramanian, R.; Miller, M.

doi:10.1109/milcom.2004.1494987

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…Each satellite has a number of transponders (receiver-to-transmitter) aboard to amplify the received signal from the uplink and then to convert the signal for transmission on the downlink. That is why it is easier to jam the uplink signal, these transponders perform a signal processing as a high power gain down converter, using a traveling wave tube amplifier Broadcast Satellites (DBS) [6] , provide TV service for the purpose of preventing the channel from the original access to users(Figure 3), alternative to attacking force is greater than the load signal from the source ground to the satellite's channel so it is reserved frequencies floor of each group or a bouquet of channels [7].…”

Section: Transpondersmentioning

confidence: 99%

The Mechanism of Deliberate Jamming On the Broadcast Satellite Service.

Mahmood¹

2012

JUAPS

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A direct broadcast satellite is making maximum efforts to transmission the TV signal from the source to the receiving in the small home earth stations, especially the important events of a widespread public demand. The power and the nature of the television signal affected by losses resulting from the length of the path and the natural noise , thus the signal's loss part of its power at the reception, but the most influential is the possibility of deliberate jamming, thus the signal of reception has loosed completely. So we are in this research analysis of the technical side to transmit the signal from the Earth station to the satellite, which is the line upward and then receive that signal and processed by machines effector inside the satellite and re-sent as a line downward to the receiving stations. The statement of the impact of deliberate jamming on that process by attacking the line upward by the largest power after the completion of the integrated analysis the original signal using sophisticated of high technology equipment. Based on that, we can see the statement of the used method to deliberate jamming on satellite's channels and methods of prevention ,then it used the simulation program (MATLAB) according to the laws relating to communication satellites, taking into account the latitude and longitude and geographic location of ground stations, satellites, sending and receiving. The results were important and productive because they determine the ability and nature of the signal for a private reception with deferent effects.

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Section: Transpondersmentioning

confidence: 99%

The Mechanism of Deliberate Jamming On the Broadcast Satellite Service.

Mahmood¹

2012

JUAPS

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“…However, it is desirable to keep back-off as low as possible in order to lower the HPA costs. Some solutions have been developed, that try to compensate for the non-linearity of the HPA amplifier by means of pre-distortion or post-distortion [1,2]. Other approaches try to decrease the PAPR through the Nyquist pulse shape optimization [3].…”

Section: Introductionmentioning

confidence: 99%

Efficient M-QAM Transmission Using Compacted Magnitude Modulation Tables

Gomes

Cercas

Silva

et al. 2008

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

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Magnitude Modulation is a technique proposed with success for QPSK and OQPSK in order to maximize power and bandwidth of small satellite earth stations, by reducing PAPR of the modulated signal at the HPA input. To meet the ever growing demand for higher data rates, higher order modulations have been considered. This paper shows that it is possible to use the magnitude modulation concept for the M-QAM case, even considering the huge number of symbol combinations. The constellation and RRC symmetries are explored, allowing considerable reduction on look-up table computation complexity and storage requirements. Experimental results show considerable gains (>2dB) in PAPR and back-off reduction for 16-QAM with negligible BER losses.

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“…However, it is desirable to keep back-off as low as possible in order to lower the HPA costs. Some solutions have been developed, that try to compensate for the non-linearity of the HPA amplifier by means of pre-distortion or post-distortion [3,4]. Other approaches try to decrease the PAPR through the Nyquist pulse shape optimization [5].…”

Section: Introductionmentioning

confidence: 99%

Low bBack-off 16-APSK transmission using magnitude modulation and symbol quantization

Gomes

Silva

Cercas³

et al. 2008

2008 IEEE International Workshop on Satellite and Space Communications

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QAM and APSK are used to meet the ever growing demand for higher data rates in bandwidth limited satellite channels whose main constraint to communication capacity is a non-linear transmitting High Power Amplifier (HPA). The inherent APSK robustness against nonlinear distortion leads to its introduction in the recent standard for Digital Video Broadcasting (DVB-S2). Power efficiency is still limited by high signal PAPR at the HPA input. Magnitude Modulation is a technique for PAPR reduction, proposed with success for QPSK. This paper shows that it is possible to use the magnitude modulation concept for the 16-APSK case, even considering the huge number of symbol combinations. The method's capability to avoid phase modulation is improved. In order to reduce look-up table computation complexity and storage requirements, the constellation symbols are vector quantized. Constellation and RRC symmetries are also explored. Experimental results show considerable gains of 80% in back-off reduction.

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Pre-distortion techniques and bandwidth efficient modulation for military satellite communications

Cited by 8 publications

References 2 publications

The Mechanism of Deliberate Jamming On the Broadcast Satellite Service.

The Mechanism of Deliberate Jamming On the Broadcast Satellite Service.

Efficient M-QAM Transmission Using Compacted Magnitude Modulation Tables

Low bBack-off 16-APSK transmission using magnitude modulation and symbol quantization

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